Battery pack, battery package, and electric device

Abstract

The application relates to a battery pack, a battery package and a power utilization device, comprising a plurality of battery monomers arranged in sequence along a first direction, each of the battery monomers being provided with a pole column at the same end in a second direction, the pole column comprising a first pole column and a second pole column with opposite polarities; a current collecting piece, the first pole column of one of the battery monomers and the second pole column of another battery monomer being electrically connected via the same current collecting piece among two adjacent battery monomers; the current collecting piece comprising a sliding joint, at least one of the first pole column and the second pole column comprising a matching part, and the matching part being slidably connected with the sliding joint along the first direction. The technical scheme of the application not only can avoid the adverse effects caused by the welding process, improve the battery monomer grouping efficiency and the grouping yield, but also can reduce the fracture risk of the current collecting piece.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery packs, battery modules and electrical devices. Background Technology

[0002] In related technologies, when integrating battery cells into modules or battery packs, the battery cells need to be fixed side-by-side before being welded to the busbar. During the fixing and welding process, the positions of the battery cells may become misaligned, leading to poor welding and other assembly problems. Furthermore, the welding process easily generates metal debris, posing safety risks such as short circuits. At the same time, the first-pass yield of the welding process generally needs improvement, resulting in rework and repairs, wasting manpower and resources.

[0003] In addition, during the use of a single battery cell, there will be changes in expansion force. Traditional busbars have poor energy absorption and are prone to breakage. Utility Model Content

[0004] Based on this, this application provides a battery pack, a battery assembly, and an electrical device, which helps to improve the efficiency of battery cell assembly and reduce the risk of busbar breakage.

[0005] In a first aspect, this application proposes a battery pack, comprising:

[0006] Multiple battery cells are arranged sequentially along a first direction. Each battery cell is provided with a terminal post at the same end in a second direction. The terminal post includes a first terminal post and a second terminal post with opposite polarities.

[0007] A busbar, wherein in two adjacent battery cells, the first terminal of one battery cell and the second terminal of the other battery cell are electrically connected via the same busbar;

[0008] The busbar includes a sliding portion, and at least one of the first pole and the second pole includes a mating portion, wherein the mating portion and the sliding portion are slidably connected along the first direction;

[0009] The first direction intersects with the second direction.

[0010] In some embodiments, the sliding joint and the mating joint are slidably engaged.

[0011] In some embodiments, the sliding joint includes a plug groove that extends longitudinally along the first direction, and the opening of the plug groove is located at one end of the sliding joint in the first direction;

[0012] The mating part includes a snap-fit ​​part, and the slot allows the snap-fit ​​part to enter and exit the insertion slot; the snap-fit ​​part passes through the insertion slot along the second direction and is movably snapped into the insertion slot along the first direction.

[0013] In some embodiments, the pole post includes a main body portion, and the snap-fit ​​portion protrudes from the main body portion along the second direction;

[0014] The mating part further includes an abutting part, which is disposed at one end of the snap-fit ​​part away from the main body and abuts against one end of the sliding part away from the main body.

[0015] In some embodiments, the insertion slot includes a first slot segment, a second slot segment, and a third slot segment, which are connected sequentially along the first direction. The slot opening is located in the third slot segment, and the second slot segment is engaged with the contour of the snap-fit ​​part.

[0016] In some embodiments, the width of the third groove segment increases progressively toward the groove opening.

[0017] In some embodiments, the width of the first groove segment is equal everywhere.

[0018] In some embodiments, the two opposite sides of the second groove segment extend in an arc shape and bend in opposite directions.

[0019] Both sides of the third groove are inclined relative to the center plane of the insertion groove, and the inclination angle α > 5°. The center plane is parallel to the first direction and the second direction.

[0020] In some embodiments, the busbar further includes a stop member disposed at one end of the slot on the sliding portion, for preventing the snap-fit ​​portion from dislodging from the slot.

[0021] In some embodiments, the sliding joint is provided with a mounting hole, and the stop member is detachably snapped into the mounting hole.

[0022] In some embodiments, at least a portion of the busbar is electrically connected to the first terminal and the second terminal via different sliding portions.

[0023] In some embodiments, at least a portion of the busbar includes a fixed portion and a sliding portion, wherein the busbar is fixedly connected to the first pole via the sliding portion and slidably connected to the second pole via the fixed portion.

[0024] In some embodiments, the busbar includes a buffer portion and a connecting portion. The buffer portion is deformably disposed along the first direction, and both ends of the buffer portion are connected to the connecting portion in the first direction. The busbar is connected to the first pole and the second pole respectively via the connecting portions at both ends.

[0025] At least one of the connecting portions of each of the aforementioned busbars is the sliding joint portion.

[0026] Secondly, this application proposes a battery pack, including a housing and the battery pack described in the first aspect, wherein the battery pack is located inside the housing.

[0027] Thirdly, this application proposes an electrical device, including the battery pack described in the first aspect or the battery module described in the second aspect.

[0028] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0029] In the aforementioned battery pack, battery module, and power supply device, the busbar is slidably connected to the first and / or second terminal via a sliding joint. This avoids the adverse effects of welding processes and improves the efficiency and yield of battery cell assembly. Furthermore, the sliding joint allows relative displacement between the busbar and the connected terminal in a first direction. When a battery cell expands along this direction, the expansion force of the battery cell will not act on the busbar, thus avoiding the risk of busbar breakage. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 These are schematic diagrams of the electrical devices according to some embodiments;

[0032] Figure 2 This is an exploded view of a battery pack according to some embodiments;

[0033] Figure 3 These are schematic diagrams of the structure of a single battery cell in some embodiments;

[0034] Figure 4 This is an exploded view of a battery cell in some embodiments;

[0035] Figure 5 These are schematic diagrams of the battery pack structure in some embodiments;

[0036] Figure 6 for Figure 5 Enlarged view of point I in the middle;

[0037] Figure 7 for Figure 5 Enlarged view at point II;

[0038] Figure 8 A partial cross-sectional view of a battery cell in some embodiments;

[0039] Figure 9 This is a perspective view of a busbar according to some embodiments;

[0040] Figure 10 for Figure 9 A front view of the aforementioned busbar;

[0041] Figure 11 This is a partial structural diagram of a battery pack according to some embodiments;

[0042] Figure 12 This is an exploded view of a battery pack according to some embodiments;

[0043] Figure 13 This is an exploded view of the battery pack in some other embodiments;

[0044] Figure 14 This is a perspective view of a busbar according to other embodiments.

[0045] The reference numerals in the detailed embodiments are as follows:

[0046] 10000 Electrical device; 1000 Battery pack; 100 Battery group; 10 Battery cell; X, First direction; Z, Second direction; Y, Third direction; 11 Terminal; 11A, First terminal; 11B, Second terminal; 11a, Connecting part; a1, Snap-fit ​​part; a2, Abutting part; 11b, Main body; 12, Housing; 13, Top cover assembly; 14, Electrode assembly; 14a, Tab; 15. Base plate; 16. Insulating film; 17. Protective film; 20. Busbar; 21. Sliding joint; 21c. Insertion groove; c1. Groove opening; c2. First groove segment; c3. Second groove segment; c4. Third groove segment; M. Center surface; 21d. Mounting hole; 22. Stop; 23. Fixed joint; 20A. Buffer part; 20B. Connecting part; 200. Housing; 210. First part; 220. Second part. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0053] In order to improve the assembly efficiency of individual battery cells and reduce the risk of busbar breakage, this application proposes a battery pack, a battery module, and an electrical device.

[0054] The battery pack or battery array in this embodiment is applied to an electrical device to provide electrical energy to the device. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, etc. (See also...) Figure 1 Taking the electrical device 10000 as an example of a vehicle, the battery pack 1000 can be located at the rear, front, or bottom of the vehicle. The battery pack 1000 can provide power for the vehicle's drive and also provide power for the vehicle's control system.

[0055] Reference Figure 2 The battery pack 1000 in this embodiment includes a battery pack 100 and a housing 200. The battery pack 100 is housed within the housing 200. In one embodiment, the housing 200 includes a first portion 210 and a second portion 220, which together form a loading space in which the battery pack 100 is housed. Regarding the formation of the loading space, it may be entirely located within the second portion 220, or it may be partially located within the second portion 220 with the other portion located within the first portion 210.

[0056] The battery pack 100 in this embodiment includes multiple battery cells 10. A battery cell 10 is the smallest unit in which an electrochemical reaction occurs within the battery, and can be a secondary battery or a primary battery. A battery cell 10 can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. A battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0057] In some embodiments, refer to Figure 3 and Figure 4The battery cell 10 includes a housing 12, a top cover assembly 13, and an electrode assembly 14. The housing 12 and the top cover assembly 13 together form an internal space for accommodating the electrode assembly 14. Specifically, the housing 12 may have a receiving cavity formed therein, with at least one end open. The top cover assembly 13 closes the open end of the housing 12 to seal the receiving cavity, and the electrode assembly 14 is mounted inside the receiving cavity. The housing 12 may be, but is not limited to, a metal housing 12, such as an aluminum housing or a steel housing. The top cover assembly 13 is typically provided with terminal posts 11.

[0058] In some embodiments, continue to refer to Figure 4 The battery cell 10 also includes a protective film 17, which wraps around the outside of the housing 12 and serves to insulate and prevent impacts and scratches to the housing 12. In a further example, refer to... Figure 4 A bottom support plate 15 is provided at the bottom of the housing 12, supporting the electrode assembly 14. The bottom support plate 15 is positioned between the housing 12 and the electrode assembly 14 to prevent interference between the bottom corners of the electrode assembly 14 and the housing 12, and to enhance the strength of the bottom of the housing 12, preventing damage to the electrode assembly 14 when the bottom of the housing 12 is impacted. Optionally, an insulating film 16 is wrapped around the electrode assembly 14 to insulate the electrode assembly 14 from the housing 12. Further optionally, an insulating film 16 is also provided between the electrode assembly 14 and the top cover assembly 13 to reduce the risk of leakage from the battery cell 10.

[0059] The battery cell 10 can be a liquid battery or a solid battery. If the battery cell 10 is a liquid battery, in some embodiments, the electrode assembly 14 includes a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. A liquid electrolyte (i.e., electrolyte solution) can be injected into the battery cell 10. The electrolyte solution wets the interior of the electrode assembly 14, providing ion migration pathways for the electrochemical reactions in the electrode assembly 14 and serving a conductive function. The electrode assembly 14 can be in the form of a wound type, a stacked type, etc. One or more electrode assemblies 14 can be loaded in the battery cell 10.

[0060] The battery pack 100 in the embodiments of this application will be described in detail below.

[0061] Please refer to Figure 5 , Figure 6 and Figure 7The battery pack 100 proposed in this application embodiment includes a plurality of battery cells 10 and a busbar 20. The plurality of battery cells 10 are arranged sequentially along a first direction X. Each battery cell 10 has a terminal post 11 at the same end in a second direction Z. The terminal post 11 includes a first terminal post 11A and a second terminal post 11B with opposite polarities. In two adjacent battery cells 10, the first terminal post 11A of one battery cell 10 and the second terminal post 11B of the other battery cell 10 are electrically connected via the same busbar 20. The busbar 20 includes a sliding portion 21. At least one of the first terminal post 11A and the second terminal post 11B includes a mating portion 11a. The mating portion 11a and the sliding portion 21 are slidably connected along the first direction X, which intersects the second direction Z.

[0062] In one application, the battery cell 10 has a cuboid structure, with the first direction X corresponding to the width direction of the battery cell 10 and the second direction Z corresponding to the height direction of the battery cell 10.

[0063] In every two adjacent battery cells 10, two terminals 11 with different polarities (the first terminal 11A and the second terminal 11B, respectively) are electrically connected through a busbar 20 to realize the series connection of the battery cells 10. In one embodiment, the same end of the battery cell 10 in the second direction Z is usually provided with two terminals 11, one of which is the first terminal 11A and the other is the second terminal 11B. The two terminals 11 are arranged at intervals along the third direction Y, which corresponds to the length direction of the battery cell 10.

[0064] In two adjacent battery cells 10, the first terminal 11A and the second terminal 11B of different battery cells 10 are arranged adjacently along the first direction X. In the same battery cell 10, the first terminal 11A is electrically connected to the second terminal 11B on one side of the battery cell 10 through a busbar 20, and the second terminal 11B is electrically connected to the first terminal 11A on the other side of the battery cell 10 through another busbar 20. The arrangement of the busbar 20 realizes the grouping of battery cells 10 to a certain extent.

[0065] The busbar 20 is conductive and can be made of copper, aluminum, or the like. The busbar 20 has a sliding contact 21 for slidingly connecting with the terminal post 11 along a first direction X. This sliding contact 21 allows the battery cell 10 to change position relative to the busbar 20 when the battery cell 10 expands, preventing the expansion force of the battery cell 10 from being transmitted to the busbar 20. In one embodiment, such as... Figure 7 As shown, the busbar 20 has two sliding joints 21, which are respectively used to slide along the first direction X with the first terminal 11A and the second terminal 11B of two adjacent battery cells 10, which can further improve the deformation buffering capacity. In another embodiment, as... Figure 6As shown, the busbar 20 includes a sliding part 21, which is slidably connected to one of the first pole 11A and the second pole 11B, and fixedly connected to the other.

[0066] In the aforementioned battery pack 100, the busbar 20 is slidably connected to the first terminal 11A and / or the second terminal 11B via a sliding joint 21. This avoids the adverse effects of the welding process and improves the assembly efficiency and yield of the battery cells 10. Furthermore, the sliding joint 21 allows relative displacement between the busbar 20 and the connected terminal 11 in the first direction X. When the battery cell 10 expands along the first direction X, the expansion force of the battery cell 10 will not act on the busbar 20, thus avoiding the risk of busbar 20 breakage.

[0067] In some embodiments, the sliding portion 21 and the mating portion 11a are slidably engaged. For example, the sliding portion 21 is provided with a bayonet, and the mating portion 11a is provided with a buckle, which engages with the bayonet. This further simplifies the assembly of the busbar 20 and the terminal post 11, and improves the packing efficiency of the battery cells 10.

[0068] In a specific embodiment, combined with Figure 8 and Figure 9 Understandably, the sliding joint 21 includes a insertion groove 21c, which extends longitudinally along a first direction X. The opening c1 of the insertion groove 21c is located at one end of the sliding joint 21 in the first direction X. The mating joint 11a includes a snap-fit ​​part a1, which is allowed to enter and exit the insertion groove 21c through the opening c1. The snap-fit ​​part a1 passes through the insertion groove 21c along a second direction Z and is movably snapped into the insertion groove 21c along the first direction X.

[0069] Understandably, the insertion slot 21c is provided through along the second direction Z, with one end open in the first direction X to form a slot c1, and the other end closed. When installing the busbar 20, the sliding part 21 and the snap-fit ​​part a1 are inserted along the first direction X. After the snap-fit ​​part a1 is inserted into the insertion slot 21c from the insertion port along the first direction X, it snaps into the insertion slot 21c, thereby realizing the snap-fit ​​between the mating part 11a and the sliding part 21.

[0070] The insertion slot 21c is arranged in a strip shape along the first direction X. When the battery cell 10 expands and the terminal post 11 moves relative to the busbar 20 along the first direction X, the snap-fit ​​part a1 moves with the terminal post 11 relative to the insertion slot 21c. That is, the insertion slot 21c allows the snap-fit ​​part a1 to slide relative to itself along the first direction X.

[0071] At this point, the mating part 11a and the sliding part 21 have simple structures, are easy to implement, and are convenient to snap together.

[0072] Further in the embodiments, refer to Figure 8The pole post 11 includes a main body 11b, a snap-fit ​​part a1 protruding from the main body 11b along the second direction Z, and a mating part 11a also includes an abutting part a2, which is disposed at the end of the snap-fit ​​part a1 away from the main body 11b and abuts against the end of the sliding part 21 away from the main body 11b.

[0073] The main body 11b is the part of the pole 11 used for electrical connection with the tab 14a, and the main body 11b is mounted on the top cover assembly. When the pole 11 and the busbar 20 are fixedly connected, the pole 11 may only include the main body 11b, and be fixedly connected to the busbar 20 through the main body 11b. When the pole 11 and the busbar 20 are fixedly connected, the connection method may be snap-fit, welding, etc.

[0074] The snap-fit ​​portion a1 protrudes from the main body portion 11b, and the projection of the snap-fit ​​portion a1 along the second direction Z falls within the range of the main body portion 11b. The abutment portion a2 is disposed at the end of the snap-fit ​​portion a1 away from the main body portion 11b, and its projection along the second direction Z extends beyond the range of the snap-fit ​​portion a1. In one embodiment, the cross-sectional areas of the snap-fit ​​portion a1, the abutment portion a2, and the main body portion 11b are all circular.

[0075] When the snap-fit ​​part a1 is inserted into the insertion slot 21c, the sliding part 21 is engaged between the abutment part a2 and the main body part 11b to prevent the sliding part 21 from disengaging from the snap-fit ​​part a1 in the second direction Z, thereby improving the assembly reliability of the mating part 11a and the sliding part 21. At the same time, it can also increase the contact area between the abutment part a2 and the sliding part 21, ensuring the current carrying capacity.

[0076] In one specific embodiment, reference is made to Figure 9 and Figure 10 The insertion slot 21c includes a first slot segment c2, a second slot segment c3 and a third slot segment c4, which are connected sequentially along the first direction X. The slot opening c1 is located in the third slot segment c4, and the second slot segment c3 is fitted with the outline of the snap-fit ​​part a1.

[0077] When the battery cell 10 is in a non-expanded state, the snap-fit ​​part a1 is snapped into the second groove section c3. Since the inner wall shape of the second groove section c3 is adapted to the outline of the snap-fit ​​part a1, the second groove section c3 plays a limiting role for the snap-fit ​​part a1, which can prevent the snap-fit ​​part a1 from coming out.

[0078] by Figure 9 Taking the indicated orientation as an example, if the battery cell 10 expands to the right, the locking part a1 slides into the first slot c2 as it moves with the terminal post 11. If the battery cell 10 expands to the left, the locking part a1 slides into the third slot c4 as it moves with the terminal post 11. It can be seen that the arrangement of the first slot c2 and the third slot c4 allows for multiple sliding directions of the locking part a1, accommodating the phenomenon of battery cells 10 expanding in different directions at different locations.

[0079] In some embodiments, refer to Figure 9 and Figure 10 The width of the third slot c4 increases towards the slot opening c1.

[0080] The width of the insertion slot 21c refers to the spacing of its slot wall in the third direction Y. The width of the third slot segment c4 increases towards the side where the second slot segment c3 is located, and the slot opening c1 is flared, which makes it easier for the snap-fit ​​part a1 to be inserted into the insertion slot 21c, thereby improving the assembly efficiency of the battery pack 100.

[0081] In some embodiments, refer to Figure 10 The width of the first groove segment c2 is equal everywhere. In practical applications, the first groove segment c2 is set to correspond to the expansion direction of the battery cell 10. If the battery cell 10 expands, the terminal post 11 on the battery cell 10 will drive the locking part a1 to move towards the first groove segment c2. At this time, designing the first groove segment c2 with a uniform groove width not only does not hinder the movement of the locking part a1 along the first groove segment c2, but also, when the expansion of the battery cell 10 disappears or decreases, under the compression of the first groove segment c2 and the driving force of the terminal post 11, the locking part a1 can be promptly reset back into the second groove segment c3, thus conforming to the breathing-like repeated expansion of the battery cell 10.

[0082] In some embodiments, refer to Figure 10 The two side walls of the second groove segment c3 extend in an arc shape and bend in opposite directions. In practical applications, the snap-fit ​​part a1 is often designed as a cylinder to reduce the friction between the snap-fit ​​part a1 and the insertion groove 21c, making it easier for the snap-fit ​​part a1 to be inserted into the insertion groove 21c. At this time, the two side walls of the second groove segment c3 extend in an arc shape and bend in opposite directions, which can effectively fit the cylindrical snap-fit ​​part a1.

[0083] In some embodiments, refer to Figure 10 The two side walls of the third groove segment c4 are inclined relative to the center plane M of the insertion groove 21c, and the inclination angle α > 5°. The center plane M is parallel to the first direction X and the second direction Z.

[0084] The insertion slots 21c are arranged symmetrically with respect to the center plane M. Since the width of the third slot segment c4 decreases towards the side where the second slot segment c3 is located, each slot wall of the third slot segment c4 is inclined relative to the center plane M. The inclination angle α between the slot wall of the third slot segment c4 and the center plane M is greater than 5°, such as 6°, 8°, 10°, etc., to facilitate the insertion of the insertion slot 21c of the busbar 20 into the snap-fit ​​part a1.

[0085] Understandably, the tilt angle α cannot be infinitely large. Given that the insertion slots 21c are of equal length, a larger α results in a larger dimension occupied by the insertion slots 21c in the third direction Y. This either leads to a larger dimension of the busbar 20 in the third direction Y, which is detrimental to the layout of the battery pack 100, or it results in low structural strength at the end of the busbar 20 where the slot c1 is located. Optionally, a tilt angle α less than or equal to 45° allows the busbar 20 to be easily inserted into the snap-fit ​​sub-part a1 through its slot, while also ensuring a reasonable balance between the structural strength and space occupied by the busbar 20.

[0086] In some embodiments, refer to Figure 11 The busbar 20 also includes a stop 22, which is disposed at one end of the slot c1 on the sliding part 21 and is used to restrict the snap-fit ​​part a1 from coming out of the slot c1.

[0087] The stop 22 is fixed on the sliding part 21, with one end installed on one side of the third groove c4 and the other end installed on the other side of the third groove c4. That is, the stop 22 spans the groove c1 of the third groove c4 to prevent the snap-fit ​​part a1 from coming out of the groove c1.

[0088] The stop 22 and the sliding joint 21 can be either fixedly connected or detachably connected.

[0089] In one specific embodiment, the sliding part 21 is provided with a mounting hole 21d, and the stop 22 is detachably snapped into the mounting hole 21d.

[0090] Specifically, the mounting hole 21d can be provided through the second direction Z or through the side of the sliding part 21 away from the battery cell 10. The two ends of the stop member 22 in the third direction Y are bent to form a retaining strip. The retaining strip is inserted into the mounting hole 21d to realize the installation of the stop member 22 on the sliding part 21.

[0091] At this point, the stop component 22 has a simple structure, is easy to install, and is more economical.

[0092] In some embodiments, such as Figure 12 As shown, at least a portion of the busbar 20 is electrically connected to the first pole 11A and the second pole 11B via different sliding contacts 21.

[0093] That is, the busbar 20 has sliding portions 21 at both ends in the second direction Z, and is slidably connected to the first terminal 11A and the second terminal 11B. In this way, the relative position between the busbar 20 and each connected battery cell 10 can change. In particular, when the expansion directions of the two battery cells 10 are different, the busbar 20 can allow each battery cell 10 to expand freely without interfering with the use of the battery cell 10.

[0094] In some embodiments, refer to Figure 13 It is understood that at least part of the busbar 20 includes a fixed connection portion 23 and a sliding connection portion 21. The busbar 20 is slidably connected to the first pole post 11A via the sliding connection portion 21 and fixedly connected to the second pole post 11B via the fixed connection portion 23.

[0095] That is, one end of the busbar 20 in the second direction Z is provided with a fixed connection part 23 to be fixedly connected to the second terminal 11B, such as by snap-fitting, bonding, welding, etc., to ensure reliability. The other end of the busbar 20 is provided with a sliding connection part 21 to be slidably connected to the first terminal 11A to adapt to the changes in expansion force of the battery cell 10 during cycling. This design simplifies the structure of the busbar 20 and reduces the modification cost of the terminal 11.

[0096] In some embodiments, refer to Figure 10 and Figure 14 The busbar 20 includes a buffer portion 20A and a connecting portion 20B. The buffer portion 20A is deformably disposed along a first direction X, and both ends of the buffer portion 20A are connected to the connecting portion 20B in the first direction X. The busbar 20 is connected to the first pole post 11A and the second pole post 11B respectively via the connecting portions 20B at both ends. At least one connecting portion 20B of each busbar 20 is a sliding joint 21.

[0097] When both ends of the busbar 20 are sliding joints 21, their ends are slidably connected to the first pole 11A and the second pole 11B, respectively. When one end of the connecting part 20B at both ends of the busbar 20 is a sliding joint 21 and the other end is a fixed joint 23, one end of the busbar 20 is slidably connected to the first pole 11A and the other end is fixedly connected to the second pole 11B.

[0098] The connecting part 20B and the buffer part 20A are generally integrally formed. The buffer part 20A is curved in the first direction X. When the reverse expansion of the battery cells 10 on both sides of the busbar 20 is too large to be offset by the sliding of the sliding part 21, the buffer part 20A is squeezed or straightened to adapt to the positional change of the battery cells 10 on both sides, so that the busbar 20 does not interfere with the expansion of the battery cells 10.

[0099] Specifically, the buffer portion 20A is bent along the second direction Z to form a buffer groove, the buffer groove extends longitudinally along the third direction Y, and is recessed along the second direction Z.

[0100] In some embodiments, such as Figure 9 and Figure 10 As shown, the insertion slot 21c extends to the buffer section 20A, which makes the partial default of the buffer section 20A not only increase the range of relative displacement between the busbar 20 and the pole post 11, but also makes it easier for the buffer section 20A to deform.

[0101] In one specific embodiment of this application, the battery cell 10 is rectangular, and multiple battery cells 10 are arranged side by side along their width direction. Each battery cell 10 has a first terminal 11A and a second terminal 11B at the same end in the height direction. The first terminal 11A and second terminal 11B of adjacent battery cells 10 are arranged adjacent to each other along the width direction of the battery cell 10. The busbar 20 includes a buffer portion 20A and connecting portions 20B connected to both ends of the buffer portion 20A. Both connecting portions 20B are sliding joints 21, and are slidably connected to the first terminal 11A and the second terminal 11B, respectively. Each sliding contact portion 21 includes a insertion groove 21c. The mating portion 11a of the first pole post 11A and the second pole post 11B each includes a snap-fit ​​portion a1 and an abutment portion a2. The snap-fit ​​portion a1 is integrally connected to the main body portion 11b. The snap-fit ​​portion a1 is inserted into the insertion groove 21c through the insertion port of the insertion groove 21c, and the sliding contact portion 21 is positioned between the abutment portion a2 and the main body portion 11b in the second direction Z. A stop member 22 is provided at one end of the groove c1 of the sliding contact portion 21. By providing the stop member 22, not only can the snap-fit ​​portion a1 be prevented from sliding out of the insertion groove 21c in the first direction, thus preventing the busbar 20 from separating from the pole post 11, but the connection stability between the busbar 20 and the pole post 11 can also be enhanced, preventing the snap-fit ​​portion a1 from moving and transitioning within the insertion groove 21c during use due to vibration and impact.

[0102] The battery pack 1000 proposed in this application includes a housing 200 and a battery pack 100 as described in the above embodiments, with the battery pack 100 located inside the housing 200. This battery pack 1000 has all the aforementioned beneficial effects, which will not be elaborated upon here.

[0103] The electrical device 10000 provided in this application includes the battery pack 100 or battery stack 1000 in the above embodiments. The electrical device 10000 has all the above-mentioned beneficial effects, which will not be elaborated here.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack (100), characterized in that, include: Multiple battery cells (10) are arranged sequentially along a first direction (X). Each battery cell (10) is provided with a terminal post (11) at the same end in a second direction (Z). The terminal post (11) includes a first terminal post (11A) and a second terminal post (11B) with opposite polarities. In a busbar (20), the first terminal (11A) of one of two adjacent battery cells (10) is electrically connected to the second terminal (11B) of the other battery cell (10) via the same busbar (20). The busbar (20) includes a sliding part (21), and at least one of the first pole (11A) and the second pole (11B) includes a mating part (11a), and the mating part (11a) and the sliding part (21) are slidably connected along the first direction (X); The first direction (X) intersects with the second direction (Z).

2. The battery pack (100) according to claim 1, characterized in that, The sliding joint (21) and the mating joint (11a) are slidably engaged.

3. The battery pack (100) according to claim 2, characterized in that, The sliding joint (21) includes a plug groove (21c), which extends longitudinally along the first direction (X), and the opening (c1) of the plug groove (21c) is located at one end of the sliding joint (21) in the first direction (X). The mating part (11a) includes a snap-fit ​​part (a1), and the slot (c1) allows the snap-fit ​​part (a1) to enter and exit the insertion slot (21c); the snap-fit ​​part (a1) passes through the insertion slot (21c) along the second direction (Z), and is movably snapped into the insertion slot (21c) along the first direction (X).

4. The battery pack (100) according to claim 3, characterized in that, The pole post (11) includes a main body (11b), and the snap-fit ​​part (a1) protrudes from the main body (11b) along the second direction (Z); The mating part (11a) further includes an abutting part (a2), which is disposed at one end of the snap-fit ​​part (a1) away from the main body part (11b) and abuts against one end of the sliding part (21) away from the main body part (11b).

5. The battery pack (100) according to claim 3, characterized in that, The insertion slot (21c) includes a first slot segment (c2), a second slot segment (c3) and a third slot segment (c4), which are connected sequentially along the first direction (X). The slot opening (c1) is located in the third slot segment (c4), and the second slot segment (c3) is engaged with the contour of the snap-fit ​​part (a1). The width of the third groove segment (c4) increases toward the groove opening (c1); and / or the width of the first groove segment (c2) is equal everywhere.

6. The battery pack (100) according to claim 5, characterized in that, The second groove segment (c3) has two oppositely arranged groove walls that extend in an arc shape and bend in opposite directions; and / or, Both sides of the third groove segment (c4) are inclined relative to the center plane (M) of the insertion groove (21c), and the inclination angle α > 5°. The center plane (M) is parallel to the first direction (X) and the second direction (Z).

7. The battery pack (100) according to claim 3, characterized in that, The busbar (20) also includes a stop (22), which is disposed at one end of the slot (c1) on the sliding part (21) to restrict the snap-fit ​​part (a1) from coming out of the slot (c1); The sliding joint (21) is provided with a mounting hole (21d), and the stop (22) is detachably snapped into the mounting hole (21d).

8. The battery pack (100) according to claim 1, characterized in that, At least a portion of the busbar (20) is electrically connected to the first terminal (11A) and the second terminal (11B) respectively via different sliding contacts (21); and / or, At least a portion of the busbar (20) includes a fixed connection portion (23) and a sliding connection portion (21), wherein the busbar (20) is fixedly connected to the first terminal (11A) via the sliding connection portion (21), and slidably connected to the second terminal (11B) via the fixed connection portion (23); and / or, The busbar (20) includes a buffer section (20A) and a connecting section (20B). The buffer section (20A) is deformably disposed along the first direction (X), and both ends of the buffer section (20A) are connected to the connecting section (20B). The busbar (20) is connected to the first pole post (11A) and the second pole post (11B) respectively via the connecting sections (20B) at both ends. At least one of the connecting portions (20B) of each of the busbars (20) is the sliding portion (21).

9. A battery pack (1000), characterized in that, It includes a housing (200) and a battery pack (100) as described in any one of claims 1 to 8, the battery pack (100) being located within the housing (200).

10. An electrical appliance (10000), characterized in that, This includes the battery pack (100) as described in any one of claims 1 to 8 or the battery pack (1000) as described in claim 9.

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